Well using Rage's idea as a jumping off point, Bucky could light up on the battlefield & Cap could say "Those'll kill ya" & he replies "I think they might have to get in line behind the Nazis!". Then when Cap's unfrozen (if they go a similar route as The Ultimates) Bucky could tell him as an old man that he has asthma & emphysema and "How does it feel to always be right?"